fussy eater

My daughter started being fussy at 2. She would stop eating different things mainly meat. We tried refusing anything else she would starve herself, we tried including her in making dinner she was happy to do this but still refused to eat the food, we even tried fause feeding her which led to her vomiting on us. It stressed us and her out so much and we hated fighting with her every night at dinner time. We decided to give up and gave her the foods we knew she would eat, mainly fruit and veggies, but always encourage and reward her trying new foods. She's now 6 and won't eat any meat of any kind she will eat mostly fruit and veggies ect. We are always worried about her weight and growth ect because she doesn't eat any meat. After a lot of drs appointments and blood tests her dr tells me she's extremely healthy with nothing wrong with being a vegetarian at this age but suggested if we could get some protein into her it would help her. I make muffins with either chia, or linseed in them also sometimes use lentils to help give her a boost ect.

My point is that why make every meal time a stressful horrible experience because they can just stop eating, if their not wanting to eat a particular food but are happy to eat other healthy food, then sometimes it's easier to give them something they will eat.